JP2021124563A - Phosphor wheel device, light source device, projection apparatus and phosphor device - Google Patents

Abstract

To provide a phosphor wheel device which has the high fluorescent emission efficiency with a simple configuration, and provide a light source device, a projection apparatus and a phosphor device.SOLUTION: A phosphor wheel device 100 comprises: an excitation light source 70 which emits excitation light; a rotor plate which has a transmission region that transmits the excitation light, a dichroic mirror region 402 and a first reflection region 302 that reflect the excitation light and a phosphor region 303 that is excited by the excitation light to emit fluorescent light; and a reflection mirror 102 which reflects the excitation light. The transmission region and the phosphor region 303 are arranged at positions overlapped with the dichroic mirror region 402. The dichroic mirror region 402 and the first reflection region 302 are arranged at mutually-different positions in the circumferential direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a phosphor wheel device, a light source device including the phosphor wheel device, a projection device including the light source device, a phosphor device, and a light source device.

Today, a projection device that collects the light emitted from a light source on a micromirror display element called a DMD (Digital Micromirror Device) or a display element such as a liquid crystal plate and displays a color image on a screen is generally used. in use.

Patent Document 1 discloses a projection device (projector) incorporating a phosphor wheel device that emits fluorescence of a color different from the excitation light when excitation light in a predetermined wavelength band is incident from a light source. It is exemplified that the excitation light is selected from the light in the blue wavelength band, and the fluorescence emitted by the phosphor wheel device is selected from the light in the red wavelength band, the light in the green wavelength band, and the like.

Japanese Unexamined Patent Publication No. 2009-277516

The configuration of the phosphor wheel device includes a reflective fluorescent wheel device and a transmissive wheel device. The phosphor wheel device disclosed in Patent Document 1 is a transmissive phosphor wheel device in which excitation light is incident from the substrate side on which the phosphor region is formed to irradiate the phosphor region, and has a simple configuration. However, the fluorescence emission efficiency due to the excitation light is lower than that of the reflection type phosphor wheel device in which the excitation light is incident from the phosphor region side on the base material. Therefore, a phosphor wheel device having a simple structure and high fluorescence emission efficiency is desired.

An object of the present invention is to provide a phosphor wheel device, a light source device, a projection device, and a phosphor device having a simple configuration and having high fluorescence emission efficiency.

The phosphor wheel device of the present invention is excited by an excitation light source that emits excitation light, a transmission region that transmits the excitation light, a dichroic mirror region that reflects the excitation light, a first reflection region, and fluorescence. A rotating plate having a phosphor region that emits light and a reflection mirror that reflects the excitation light are provided, and the transmission region and the phosphor region are arranged at positions overlapping with the dichroic mirror region. The dichroic mirror region and the first reflection region are arranged at different positions in the circumferential direction.

The light source device of the present invention includes the above-mentioned phosphor wheel device, the excitation light source is composed of a semiconductor light emitting element, emits blue wavelength band light as the excitation light, and the phosphor region is excited. When the light is irradiated, the light including the red wavelength band light or the green wavelength band light is emitted.

The projection device of the present invention projects the above-mentioned light source device, a display element that is irradiated with the light source light from the light source device to form image light, and the image light emitted from the display element onto a projected object. It is characterized by including a projection optical system and a projection device control unit that controls the display element and the light source device.

The phosphor device of the present invention includes an excitation light source that emits excitation light, a phosphor region that is excited by the excitation light and emits fluorescent light, a transmission region that transmits the excitation light and the fluorescent light, and the excitation. It is characterized by including a layer having a dichroic mirror region that reflects light and transmits the fluorescent light.

The light source device of the present invention has a layer having an excitation light source that emits excitation light, a reflection region that reflects the excitation light, and a diffusion transmission region that diffuses and transmits the excitation light, and the excitation light reflected in the reflection region. It is characterized by including a reflection mirror that reflects the light and guides the light to the diffused transmission region.

The light source device of the present invention is configured to emit excitation light having a blue wavelength band and to rotate about a predetermined axis, and is arranged on the optical path of the excitation light emitted from the excitation light source. By doing so, the rotating plate includes a rotating plate in which the region to which the excitation light is irradiated changes with rotation about the predetermined axis, and a reflecting mirror that reflects the excitation light. It is arranged so that the excitation light is irradiated from a direction inclined with respect to the predetermined axis, and has a first layer located on the upstream side and a second layer located on the downstream side in the optical path. The second layer includes a dichroic mirror region that reflects light in the blue wavelength band and transmits light in the green wavelength band, and a first transmission region that transmits both light in the blue wavelength band and light in the green wavelength band. The rotating plate is provided so as to approach the irradiation position of the excitation light at different timings when the rotating plate is rotated, and the irradiated excitation light is reflected by the first layer toward the reflection mirror. The first reflection region and the second transmission region that transmits the excitation light reflected from the reflection mirror toward the second layer are provided at positions overlapping with the first transmission region and are irradiated. A third transmission region that transmits the excited light toward the dichroic mirror region and a phosphor region that emits fluorescent light having a green wavelength band based on the excitation light reflected in the dichroic mirror region are formed. It is characterized in that it is provided at a position overlapping the dichroic mirror region.

According to the present invention, there is provided a phosphor wheel device having a high fluorescence emission efficiency, a light source device including the phosphor wheel device, a projection device including the light source device, a phosphor device and a light source device having a simple configuration. be able to.

It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. It is a correspondence figure which shows the correspondence relationship of the 1st layer and the 2nd layer provided in the phosphor wheel apparatus which concerns on embodiment of this invention. It is a top view which shows the 1st layer of FIG. 3 which concerns on embodiment of this invention. It is a top view which shows the 2nd layer of FIG. 3 which concerns on embodiment of this invention. It is a partial plan view of the case where the excitation light of the light source device according to the embodiment of the present invention is diffused and transmitted, and for the phosphor wheel device, the VIa-VIa end face of the rotating plate shown in FIG. The VIb-VIb end face of the layer is shown. It is a partial plan schematic view of the case where fluorescence is emitted by the excitation light of the light source apparatus which concerns on embodiment of this invention, and about the phosphor wheel apparatus, the VIIa-VIIa end face of the rotating plate shown in FIG. The VIIb-VIIb end face of the layer is shown.

(Embodiment)
Hereinafter, embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a functional circuit block of the projection device control unit of the projection device 10. The projection device control unit includes a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, a display encoder 24, and a formatter unit including a display drive unit 26. Image signals of various standards input from the input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and the system bus (SB) so as to be unified into an image signal of a predetermined format suitable for display. After that, it is output to the display encoder 24.

The display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

The display drive unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24.

Then, the projection device 10 irradiates the display element 51 with the light beam emitted from the light source device 60 via the light source side optical system 170 to form an optical image with the reflected light of the display element 51, and the projection optics The image is projected and displayed on a projected object such as a screen (not shown) via the system 220 (see FIG. 2). The movable lens group 235 of the projection optical system 220 can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

The image compression / decompression unit 31 performs recording processing in which the luminance signal and color difference signal of the image signal are data-compressed by processing such as ADCT and Huffman coding and sequentially written to the memory card 32 which is a detachable recording medium.

Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, and decompresses the individual image data constituting the series of moving images in units of one frame. The image compression / decompression unit 31 outputs the image data to the display encoder 24 via the image conversion unit 23, and performs a process that enables display of a moving image or the like based on the image data stored in the memory card 32. ..

The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a ROM that fixedly stores operation programs such as a CPU and various settings, a RAM that is used as a work memory, and the like. ..

The operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper panel of the housing is directly transmitted to the control unit 38. The key operation signal from the remote controller is received by the Ir receiving unit 35, and the code signal demodulated by the Ir processing unit 36 is output to the control unit 38.

The control unit 38 is connected to the voice processing unit 47 via the system bus (SB). The voice processing unit 47 includes a sound source circuit such as a PCM sound source, converts voice data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to make a loudspeaker sound.

Further, the control unit 38 controls the light source control circuit 41 as the light source control unit. The light source control circuit 41 includes an excitation light source 70 (blue wavelength band light, green wavelength band light, red wavelength band light, etc.) described later so that light in a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. The operation of the light source device 60 including the blue laser diode 71 which is the light source of the excitation light (for example, by turning on or off the power supply of the blue laser diode 71 in a time-divided manner, the light source device 60 can receive arbitrary light (blue laser diode 71). Light produced by additively mixing three types of light: blue wavelength band light with blue wavelength band light as a light source, green wavelength band light emitted by excitation light with a blue laser diode 71 as a light source, and red wavelength band light). ) Can be controlled.

Further, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the light source device 60 or the like, and controls the rotation speed of the cooling fan 261 from the result of the temperature detection. Further, the control unit 38 keeps the cooling fan 261 rotating even after the power of the projection device 10 main body is turned off by a timer or the like in the cooling fan drive control circuit 43, or the projection device 10 depends on the result of temperature detection by the temperature sensor. Controls such as turning off the power of the main body.

Next, the internal structure of the projection device 10 will be described. FIG. 2 is a schematic plan view showing the internal structure of the projection device 10. Here, the housing of the projection device 10 is formed in a substantially box shape, and includes a front panel 12, a back panel 13, a right panel 14, and a left panel 15. In the following description, the left and right in the projection device 10 indicate the left-right direction with respect to the projection direction, and the front-back means the front-back direction with respect to the screen side direction of the projection device 10 and the traveling direction of the light flux. ..

The front panel 12, the right panel 14, and the left panel 15 are each provided with a plurality of exhaust holes 17. The back panel 13 and the left panel 15 are each provided with a plurality of intake holes 18. Further, a cooling fan 261 is provided in the vicinity of the front panel 12 and the back panel 13. The inside of the projection device 10 is cooled by the exhaust hole 17, the intake hole 18, the cooling fan 261 and the like.

The projection device 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power supply circuit block, a light source control block, and the like. Further, the projection device 10 includes a light source device 60 on the side of the control circuit board 241, that is, in a substantially central portion of the projection device 10 housing. Further, in the projection device 10, a light source side optical system 170 and a projection optical system 220 are arranged between the light source device 60 and the left panel 15.

The light source device 60 includes an excitation light source 70 which is a light source of blue wavelength band light and is a light source of excitation light, and a phosphor wheel device 100. The phosphor wheel device 100 can diffuse and transmit blue wavelength band light and fluoresce light using blue wavelength band light as excitation light. In the present embodiment, the phosphor wheel device 100 fluoresces the red wavelength band light and the green wavelength band light. Therefore, the red light source device and the green light source device are composed of the excitation light source 70 and the phosphor wheel device 100. Each color wavelength band light emitted from the phosphor wheel device 100 is condensed and then incident on an incident port of a light guide device 175 such as a light tunnel or a glass rod.

The excitation light source 70 is a portion on the left side of the projection device 10 housing in the left-right direction and is arranged closer to the front panel 12. Further, the excitation light source 70 has a light source group including a blue laser diode 71. The light source group consists of a blue laser diode 71, which is a plurality of semiconductor light emitting elements arranged so that their optical axes are parallel to each other.

The light source group is formed by arranging a plurality of semiconductor light emitting elements, blue laser diodes 71, in a matrix. Further, on the optical axis of each blue laser diode 71, a collimator lens 73 that converts the light emitted from each blue laser diode 71 into parallel light is arranged so as to enhance the directivity of the light emitted from each blue laser diode 71. Further, a condenser lens 72 is arranged in front of these light source groups, and is arranged so that the light emitted from the light source group is generally focused on the phosphor region 303.

The phosphor wheel device 100 is on the optical path of the excitation light emitted from the excitation light source 70, and is arranged substantially at the center of the light source device 60. The phosphor wheel device 100 includes a phosphor wheel 101 arranged so as to be parallel to the front panel 12, a motor 110 that rotationally drives the phosphor wheel 101, and a drive control device (not shown) that drives and controls the motor 110. A reflection mirror 102 that reflects the excitation light reflected from the phosphor wheel 101 toward the phosphor wheel 101 again, and a condenser lens that collects a bundle of light rays emitted from the phosphor wheel 101 in the rear panel 13 direction. A group 111 and the like. The drive control device is controlled by the light source control circuit 41 described above. Details of the configuration of the phosphor wheel device 100 will be described later.

The light source side optical system 170 includes a light guide device 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. Since the condenser lens 195 emits the image light emitted from the display element 51 arranged on the back panel 13 side of the condenser lens 195 toward the projection optical system 220, it is also regarded as a part of the projection optical system 220. There is.

The light guide device 175 is arranged in the vicinity of the condenser lens group 111 of the phosphor wheel device 100. Therefore, the red wavelength band light, the green wavelength band light, and the blue wavelength band light are collected by the condenser lens group 111 and incident on the light guide device 175. The light beam incident on the light guide device 175 is made into a light light bundle having a uniform intensity distribution by the light guide device 175.

An optical axis conversion mirror 181 is arranged on the optical axis on the back panel 13 side of the light guide device 175 via a condenser lens 178. The light beam bundle emitted from the exit port of the light guide device 175 is focused by the condenser lens 178, and then the optical axis is converted to the left panel 15 side by the optical axis conversion mirror 181.

The light beam reflected by the optical axis conversion mirror 181 is focused by the condenser lens 183, and then is irradiated to the display element 51 by the irradiation mirror 185 via the condenser lens 195 at a predetermined angle. The display element 51, which is a DMD, is provided with a heat sink 190 on the back panel 13 side, and the display element 51 is cooled by the heat sink 190.

The light bundle, which is the light source light emitted from the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51 and projected onto the screen as projected light via the projection optical system 220. NS. Here, the projection optical system 220 is composed of a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is movably formed by the lens motor 45. The movable lens group 235 and the fixed lens group 225 are built in the fixed lens barrel. Therefore, the fixed lens barrel provided with the movable lens group 235 is a variable focus type lens, and is formed so that zoom adjustment and focus adjustment are possible.

By configuring the projection device 10 in this way, when the phosphor wheel 101 is rotated and light is emitted from the excitation light source 70, the red, green, and blue wavelength band lights are emitted from the condenser lens group 111 and the light guide device 175. Since the light is sequentially incident on the display element 51 via the light source side optical system 170, the DMD, which is the display element 51 of the projection device 10, displays the light of each color in a time-divided manner according to the data. A color image can be projected onto the light source.

Next, the phosphor wheel 101 of the phosphor wheel device 100 will be described in detail with reference to FIGS. 3 to 7. FIG. 3 is a correspondence diagram showing a correspondence relationship between the first layer 103 and the second layer 104 provided in the phosphor wheel device 100. FIG. 4 is a plan view showing the first layer 103. FIG. 5 is a plan view showing the second layer 104. FIG. 6 is a partial plan schematic view when the excitation light of the light source device 60 is diffused and transmitted. FIG. 7 is a partial plan schematic view of a case where fluorescence is emitted by the excitation light of the light source device 60.

As shown in FIG. 3, the phosphor wheel 101 (rotating plate) included in the phosphor wheel device 100 is composed of a first layer 103 and a second layer 104. The first layer 103 and the second layer 104 are planar and circular, and are arranged so as to overlap each other (parallel to each other) (see also FIGS. 4 and 5). The first layer 103 is located upstream of the second layer 104 in the optical path of the excitation light. The second layer 104 is arranged on the other side 103a side of the first layer 103, which is located on the downstream side of the first layer 103, and the motor 110 is arranged on the one side 103b side of the first layer 103 (FIGS. 6 and 6). (See FIG. 7). Then, as shown in FIGS. 6 and 7, the first layer 103 and the second layer 104 are pivotally supported by the motor shaft 110a extending from the motor 110. A bearing 103A and a bearing 104A penetrating in the plate thickness direction are formed at the centers of the first layer 103 and the second layer 104, respectively. The motor shaft 110a first penetrates the bearing 103A of the first layer 103, then penetrates the bearing 104A of the second layer 104, and fixes the first layer 103 and the second layer 104. The motor shaft 110a may be fixed without penetrating the second layer 104. In this case, the bearing 104A may penetrate or be formed in a bottomed tubular shape. The first layer 103 and the second layer 104 can be formed of a transparent member such as a transparent plastic material, a resin material, or a glass material.

The first layer 103 has a third transparent region 301. As shown in FIGS. 3 and 4, the third transmission region 301 is formed in a C ring shape on the outer peripheral edge side of the first layer 103. The third transmission region 301 is formed from the other surface 103a (upstream side in the optical path) of the first layer 103 to the one surface 103b (downstream side in the optical path) (see FIG. 6). The third transmission region 301 is formed by a transparent member forming the first layer 103, and can transmit visible light including excitation light emitted from the excitation light source 70.

The first layer 103 has a first reflection region 302. The first reflection region 302 is formed on the outer peripheral edge side of one surface 103b of the first layer 103 (see FIGS. 6 and 7). The first reflection region 302 is located on one surface of the reflection region 302a of the blue wavelength band light shown in FIGS. 3 and 4, and is formed in an arc shape. The first reflection region 302 can be formed by, for example, a mirror that reflects light. The first reflection region 302 can also be formed on the other surface 103a (reflection region 302a) of the first layer 103. The third transmission region 301 and the first reflection region 302 are arranged side by side in the circumferential direction at substantially the same radial position of the first layer 103.

The first layer 103 has a phosphor region 303. As shown in FIGS. 3 and 4, the phosphor region 303 is formed in a C ring shape inside the third transmission region 301 on the other surface 103a of the first layer 103. The phosphor region 303 is provided on the reflective surface 303-1 formed on the other surface 103a of the first layer 103. The reflecting surface 303-1 can reflect the excitation light and the fluorescent light. The phosphor region 303 has a first phosphor region 303a and a second phosphor region 303b. The first phosphor region 303a and the second phosphor region 303b are formed so as to divide the phosphor region 303 into each region in the circumferential direction, and each has different fluorescence emission characteristics. When the first phosphor region 303a is irradiated with the excitation light (blue wavelength band light) emitted from the excitation light source 70, the red wavelength band light is fluorescently emitted. When the second phosphor region 303b is irradiated with the excitation light (blue wavelength band light) emitted from the excitation light source 70, the second phosphor region 303b fluoresces the green wavelength band light.

The first layer 103 has a diffusion transmission region 304 (second transmission region). As shown in FIGS. 3 and 4, the diffusion transmission region 304 is formed in an arc shape inside the reflection region 302a of the other surface 103a of the first layer 103, and is juxtaposed with the phosphor region 303 in the circumferential direction. The diffusion transmission region 304 diffuses and transmits the excitation light (blue wavelength band light) emitted from the excitation light source 70. The diffusion transmission region 304 can be formed of a plastic material, a transparent resin, or a glass material. The diffusion transmission region 304 may be formed on the second layer 104.

The first layer 103 has a rotating plate central portion 305. The rotating plate central portion 305 is formed in the center inside the phosphor region 303 and the diffusion transmission region 304 of the first layer 103. In the first layer 103, the central portion 305 of the rotating plate can be formed of metal or a transparent member. When the first layer 103 is made of a material having no translucency such as metal, the third transmissive region 301 can be composed of another member having translucency.

The second layer 104 has a first transmission region 401. As shown in FIGS. 3 and 5, the first transmission region 401 is formed in an arc shape on the outer peripheral edge side of the second layer 104. The first transparent region 401 is integrally connected to the second layer central portion 403, which will be described later, and the alternate long and short dash line shown in FIG. 5 defines the boundary between the first transparent region 401 and the second layer central portion 403. show. Further, the first transmission region 401 is formed over the other surface 104a and the one surface 104b of the second layer 104. Then, in the first transmission region 401, the excitation light (blue wavelength band light) emitted from the excitation light source 70 and the excitation light (blue wavelength band light) emitted from the excitation light source 70 are irradiated to the phosphor region 303. This makes it possible to transmit fluorescent light that emits fluorescence.

The second layer 104 has a dichroic mirror region 402. As shown in FIGS. 3 and 5, the dichroic mirror region 402 is formed in a C ring shape on the outer peripheral edge side of the other surface 104a of the second layer 104. The dichroic mirror region 402 is juxtaposed with the first transmission region 401 in the circumferential direction. Further, the first transmission region 401 is arranged so that the positions in the radial direction overlap with the first reflection region 302 and the diffusion transmission region 304 in a plan view in which the first layer 103 and the second layer 104 are overlapped. The dichroic mirror region 402 is arranged so that the positions in the radial direction overlap with the third transmission region 301 and the phosphor region 303 in a plan view in which the first layer 103 and the second layer 104 are overlapped. The dichroic mirror region 402 reflects the excitation light (blue wavelength band light) emitted from the excitation light source 70, and the excitation light (blue wavelength band light) emitted from the excitation light source 70 irradiates the phosphor region 303. It has the property of transmitting fluorescent light that emits fluorescent light. The dichroic mirror region 402 can be formed by, for example, a dichroic filter.

The second layer 104 has a second layer central portion 403. The central portion 403 of the second layer is formed inside the first transmission region 401 and the dichroic mirror region 402 of the second layer 104. In the second layer 104, the central portion 403 of the second layer can be formed of metal or a transparent member. When the second layer 104 is made of a material having no translucency such as metal, the first transmissive region 401 can be formed of another member having translucency.

As shown in FIGS. 6 and 7, the reflection mirror 102 included in the phosphor wheel device 100 is arranged on one side 103b side of the first layer 103 and between the excitation light source 70 and the motor 110. Then, the reflection mirror 102 forms a reflection surface on one surface 103b side of the first layer 103.

Next, the operation of the phosphor wheel device 100 will be described with reference to FIGS. 6 and 7. The excitation light (blue wavelength band light) emitted from the excitation light source 70 irradiates the first layer 103 of the phosphor wheel device 100. At this time, the phosphor wheel 101 (first layer 103 and second layer 104) of the phosphor wheel device 100 is rotated around the motor shaft 110a by the motor 110. At this time, the boundary B1 and the boundary B2 of the third transmission region 301 and the phosphor region 303, the first reflection region 302 and the diffusion transmission region 304 are the dichroic mirror region 402 and the first transmission region, respectively, in a plan view. It rotates synchronously at the same angular speed while matching the boundary B3 and the boundary B4 with the 401 (see FIG. 3). The excitation light irradiated to the first layer 103 is incident on the third transmission region 301 or the first reflection region 302 of the one surface 103b of the first layer 103 in a time-division manner from an oblique direction (non-vertical direction) and is irradiated. NS.

Assuming that the excitation light emitted to the third transmission region 301 of the first layer 103 is the first excitation light, the optical path of the first excitation light is the optical path as shown in FIG. First, the first excitation light is refracted because it is incident on the third transmission region 301 of the first layer 103 from the air. The first excitation light refracted by being incident on the third transmission region 301 is refracted because it passes through the third transmission region 301 and is emitted into the air from the other surface 103a of the first layer 103. The first excitation light emitted into the air from the third transmission region 301 passes through the air and then enters the one surface 104b of the second layer 104 from an oblique direction (non-vertical direction). Here, the second layer 104 is formed of a transparent member. Therefore, the first excitation light is refracted by being incident on the second layer 104. The first excitation light incident on the second layer 104 passes through the inside of the second layer 104, is reflected by the dichroic mirror region 402, passes through the inside of the second layer 104 again, and then one surface of the second layer 104. It is emitted from 104b into the air. The first excitation light emitted into the air from one surface 104b of the second layer 104 is refracted, then passes through the air, and is irradiated to the phosphor region 303 of the first layer 103.

The phosphor region 303 emits fluorescent light when irradiated with the first excitation light. The fluorescent light emitted mainly in the vertical direction (the axial direction of the motor shaft 110a) by the phosphor region 303 is incident on one surface 104b of the second layer 104. Then, the fluorescent light incident on one surface 104b of the second layer 104 passes through the inside of the second layer 104 and the dichroic mirror region 402 in order. The fluorescent light transmitted through the dichroic mirror region 402 is the red wavelength band light when the first phosphor region 303a is irradiated with the first excitation light or the second phosphor region 303b when the first excitation light is irradiated. As the green wavelength band light, it is condensed by the condenser lens group 111 and then incident on the light guide device 175.

Assuming that the excitation light emitted to the first reflection region 302 of the first layer 103 is the second excitation light, the optical path of the second excitation light is the optical path as shown in FIG. 7. First, the second excitation light is applied to the first reflection region 302 of the first layer 103 and is reflected toward the reflection mirror 102. The second excitation light incident on the reflection mirror 102 is reflected by the reflection mirror 102 and vertically incident on one surface 103b of the first layer 103. The second excitation light incident on the first layer 103 passes through the inside of the first layer 103, then enters the diffusion transmission region 304 and is diffused. Next, the second excitation light diffused by the diffusion transmission region 304 enters the one surface 104b of the second layer 104, passes through the inside of the second layer 104, and then emits light from the other surface 104a of the second layer 104. Will be done. The second excitation light emitted from the other surface 104a of the second layer 104 is condensed by the condenser lens group 111 as blue wavelength band light and then incident on the light guide device 175.

In this embodiment, the phosphor wheel device 100 that emits the excitation light and the fluorescent light can be configured by providing the excitation light with two optical paths. Further, when the phosphor region 303 is irradiated with the excitation light (first excitation light), strong fluorescent light is emitted in the direction opposite to the incident direction of the excitation light (first excitation light). In this embodiment, the phosphor region 303 is irradiated after being reflected by the dichroic mirror region 402 of the second layer 104, and the excitation light (first excitation light) is incident in the incident direction (from the second layer 104 to the first layer 103). The fluorescent light emitted in the direction opposite to the direction (direction) (direction from the first layer 103 to the second layer 104) is used. Further, the excitation light that is incident on the phosphor region 303 and does not excite the phosphor region 303 is reflected by the reflection surface 303-1 and can be used as the excitation light of the phosphor region 303 again. Then, even if a part of the excitation light is reflected on the second layer 104 side, it can be reflected again on the phosphor region 303 side by the dichroic mirror region 402. Therefore, the phosphor wheel device 100 of the present embodiment can exhibit high fluorescence emission efficiency.

The first layer 103 and the second layer 104 of the present embodiment may be one member including the phosphor region 303 and the diffusion transmission region 304. Further, the first layer 103 and the second layer 104 may be synchronously rotated by the motor 110 in a state of being in contact with each other. The third transmission region 301 and the first transmission region 401 may be notched in an arc shape without arranging the members.

(Modification example 1)
Next, a modification 1 of the present invention will be described. In the description of this modification, the description of the same configuration as that of the above-described embodiment will be omitted or simplified. In this modification, the phosphor wheel 101 (first layer 103 and second layer 104) is changed to a configuration in which the motor 110 is rotated, and a phosphor device using a plate member (layer) is used.

In this modification, instead of the phosphor wheel 101 (first layer 103 and second layer 104), three fixed plate members are used. The excitation light source 70 includes a first light source group composed of a blue laser diode 71 as a light source for excitation light of fluorescent light (red wavelength band light and green wavelength band light) and a blue laser as a light source for blue wavelength band light. It can be composed of a second light source group composed of the diode 71. The excitation light emitted from the first light source group will be referred to as a third excitation light, and the excitation light emitted from the second light source group will be referred to as a fourth excitation light.

Of the three plate members, the two plate members (the first plate member and the second plate member) are the first plate member (corresponding to a part on the right side of the first layer 103 in FIG. 6). A transmission portion (corresponding to the third transmission region 301) for transmitting the excitation light and a phosphor region (corresponding to the phosphor region 303) for emitting fluorescent light by the first excitation light are formed, and a third plate member is formed. A reflection transmitting portion (corresponding to the dichroic mirror region 402) that reflects the excitation light and transmits the fluorescent light is formed. In this modification, the third excitation light passes through the transmissive portion of the first plate member, is reflected by the reflective transmissive portion of the second plate member, and then irradiates the phosphor region of the first plate member. By irradiating the phosphor region of the first plate member with the third excitation light, fluorescent light such as red wavelength band light and green wavelength band light is emitted. Therefore, this modification can emit fluorescent light such as red wavelength band light and green wavelength band light. The first plate member and the second plate member can be arranged in parallel as in the first layer 103 and the second layer 104 in the above-described embodiment.

Of the three plate members, the remaining one plate member (third plate member corresponding to a part on the left side of the first layer 103 in FIG. 6) has a reflecting portion (first plate member) that reflects the fourth excitation light. By forming a diffuse transmission portion (corresponding to the diffusion transmission region 304) that diffuses and transmits the fourth excitation light (corresponding to the reflection region 302), the fourth excitation light reflected by the reflection portion is reflected by the reflection mirror 102. The diffusion and transmission portion can be irradiated and transmitted. As a result, this modification can emit blue wavelength band light.

In this modification, the first plate member and the second plate member may be a single thick plate member. In that case, the one plate member emits fluorescent light by a transmitting portion that transmits the third excitation light and the fluorescent light, a reflected transmitting portion that reflects the third excitation light and transmits the fluorescent light, and the third excitation light. It has a phosphor. The one plate member causes the first excitation light to enter the transmitting portion from an oblique direction (non-vertical direction) and transmits the transmitting portion. Then, the one plate member can emit the fluorescent light by reflecting the third excitation light by the reflection transmitting portion and irradiating the phosphor with the third excitation light.

That is, in the case of a single plate member, the transmitting portion that transmits the excitation light and the fluorescent light serves as the base material in both the first region and the second region. In the first region of the base material, a phosphor region (303) that is excited by the excitation light and emits fluorescent light is formed on one surface side on which the excitation light is incident with reference to this base material. Then, a reflection transmitting portion (402) that reflects the excitation light and transmits the fluorescent light is provided on the other surface side of the base material. In the second region of the base material, a reflecting portion (302) that reflects the excitation light is provided on one surface side on which the excitation light is incident with reference to this base material. Then, a diffusion transmitting portion (304) that diffuses and transmits the excitation light is formed on the other surface side of the base material. Further, a reflection mirror 102 that reflects the excitation light reflected by the reflection unit (302) and guides it to the diffusion transmission unit (304) is provided.

Further, the phosphor device of the present modification has a configuration in which a diffused transmission portion for directly diffusing and transmitting the fourth excitation light is formed without providing a reflecting portion on the third plate member and without providing the reflecting mirror 102. You can also. In this case, the blue wavelength band light is emitted by transmitting the fourth excitation light through the diffusion transmission portion of the third plate member.

(Modification 2)
Next, a modification 2 of the present invention will be described. In the description of this modification, the description of the same configuration as that of the above-described embodiment and modification 1 will be omitted or simplified. In this modification, the first layer 103 is inclined from the outer peripheral edge toward the bearing 103A to form a convex shape (substantially conical shape) toward the light guide device 175 side in FIG. With this configuration, the phosphor region 303 is formed on an inclined surface. By tilting the phosphor region 303, the first excitation light reflected from the dichroic mirror region 402 can be incident at an angle closer to vertical. In this modification, the first layer 103 may be formed in a concave shape (substantially concave conical shape) in which the first layer 103 is inclined from the outer peripheral edge toward the bearing 103A and the light guide device 175 side is recessed.

As described above, according to the embodiment of the present invention, the phosphor wheel device 100 includes an excitation light source 70 that emits excitation light, a third transmission region 301 that transmits the excitation light, a first reflection region 302 that reflects the excitation light, and the like. The first layer 103 having a phosphor region 303 that is excited by the excitation light and emits fluorescent light, and a reflection mirror 102 that reflects the excitation light are provided, and the excitation that is applied to the third transmission region 301 from the excitation light source 70 is provided. The first excitation light, which is light, is applied to the phosphor region 303, and the second excitation light, which is the excitation light emitted from the excitation light source 70 to the first reflection region 302, is reflected by the reflection mirror 102 and transmitted to the third transmission. It is incident on the region 301.

As a result, the configuration of the phosphor wheel device 100 can be made into two optical paths, one is when the excitation light is used for fluorescence emission and the other is when the excitation light is diffused and transmitted. With these two optical paths, a phosphor wheel device 100 that exhibits high fluorescence emission efficiency can be configured. In this configuration, one excitation light can be used to emit light in at least two wavelength bands.

Further, the first layer 103 has a diffusion transmission region 304, the diffusion transmission region 304 diffuses the second excitation light reflected by the reflection mirror 102, and the first reflection region 302 and the diffusion transmission region 304 are the first. The layers 103 are provided so as to be positioned differently in the radial direction. As a result, the second excitation light reflected by the reflection mirror 102 can be diffused. Further, since the reflection mirror 102 can provide the first reflection region 302 and the diffusion transmission region 304 so that their positions are different in the radial direction on the rotating plate, the width of the layout of the first reflection region 302 and the diffusion transmission region 304 is wide. Spreads.

Further, the diffusion transmission region 304 is formed on one surface (the other surface 103a) side of the first layer 103, and the first reflection region 302 is formed on the other surface (one surface 103b) side of the first layer 103 and is reflected. The mirror 102 is formed on the other surface (one surface 103b) side of the first layer 103. As a result, the second excitation light transmitted through the third transmission region 301 of the first layer 103 can be diffused. Further, since the first reflection region 302 and the diffusion transmission region 304 are formed on different surfaces of the first layer 103, the width of the shape or layout of the first reflection region 302 and the diffusion transmission region 304 is widened.

Further, the phosphor region 303 includes a first phosphor region 303a and a second phosphor region 303b in which the wavelength band of the fluorescent light excited by the excitation light is different from that of the first phosphor region 303a. Thereby, light having at least three kinds of wavelength bands can be produced from one excitation light.

Further, a second layer 104 that overlaps with the first layer 103 is provided, and the second layer 104 reflects the first transmission region 401 that transmits the excitation light and the fluorescence light and the first excitation light to the phosphor region 303 to fluoresce. It has a dichroic mirror region 402 that transmits light. As a result, the phosphor region 303 can be irradiated with the first excitation light from the second layer 104 toward the first layer 103, and the fluorescent light emitted from the first layer 103 toward the second layer 104 can be used. Therefore, the configuration has high fluorescence emission efficiency.

Further, the phosphor region 303 and the diffusion transmission region 304 are arranged side by side in the circumferential direction. As a result, the first layer 103 can be rotated and the excitation light can be switched to the first excitation light or the second excitation light in a time-division manner.

Further, the projection device 10 includes a light source device 60 including the phosphor wheel device 100. Thereby, the light source device 60 and the projection device 10 having a simple configuration can be provided.

Further, the phosphor device includes an excitation light source 70 that emits excitation light and a plate member that emits fluorescent light by the excitation light, and the plate member is a phosphor region that is excited by the excitation light and emits fluorescent light. A first plate member having a transmitting portion that transmits the excitation light and a second plate member having a reflection transmitting portion that reflects the excitation light and transmits the fluorescent light, and the excitation light is transmitted through the first plate member. After passing through the portion and being reflected by the reflected transmitting portion, the phosphor region is irradiated, and the fluorescent light is transmitted through the reflected transmitting portion. This makes it possible to provide a phosphor device having high fluorescence emission efficiency without using a motor 110. Further, power saving can be achieved because the motor 110 is not used.

Further, the phosphor device includes a plate member having an excitation light source 70 that emits excitation light, a phosphor region that is excited by the excitation light and emits fluorescence light, and a reflection transmission portion that reflects the excitation light and transmits the fluorescence light. , The excitation light is incident on the plate member from an oblique direction, is reflected by the reflection / transmission portion, and then is irradiated to the phosphor region, and the fluorescence light is transmitted through the reflection / transmission portion. As a result, even if there is only one plate member, if the incident angle of the excitation light with respect to the substrate is non-vertical, the excitation light can be reflected in the reflection transmission region and then irradiated to the phosphor.

Further, the light source device 60 includes the phosphor device, a plate member having a reflecting portion that reflects the excitation light, a diffusion transmitting portion that diffuses and transmits the excitation light, and a diffused transmission that reflects the excitation light reflected by the reflecting portion. A reflection mirror 102 that guides the unit is provided. As a result, the excitation light can be reflected by the reflecting portion and then incident, so that the width of the layout of the plate member is widened.

Moreover, the embodiment described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The inventions described in the first claims of the present application are described below.
[1] An excitation light source that emits excitation light and
A rotating plate having a transmission region that transmits the excitation light, a dichroic mirror region and a first reflection region that reflect the excitation light, and a phosphor region that is excited by the excitation light and emits fluorescent light.
A reflection mirror that reflects the excitation light,
With
The transmission region and the phosphor region are arranged at positions overlapping with the dichroic mirror region.
A phosphor wheel device characterized in that the dichroic mirror region and the first reflection region are arranged at different positions in the circumferential direction.
[2] The transmission region includes a first transmission region and a third transmission region.
The phosphor wheel device according to the above [1], wherein the transmission region arranged at a position overlapping the dichroic mirror region is the third transmission region.
[3] The excitation light irradiated to the third transmission region is transmitted to the third transmission region, reflected by the dichroic mirror region, and then irradiated to the phosphor region.
The excitation light irradiated to the first reflection region is reflected by the reflection mirror after being reflected by the first reflection region, and is incident on the first transmission region according to the above [2]. The phosphor wheel device described.
[4] The rotating plate has a first layer and a second layer that overlaps with the first layer.
The second layer has the first transmission region and the dichroic mirror region.
The phosphor wheel device according to the above [2] or the above [3], wherein the dichroic mirror region transmits the fluorescent light.
[5] The rotating plate has a second transmission region and has a second transmission region.
The second transmission region is a diffusion transmission region, and is
The diffusion transmission region diffuses and transmits the excitation light reflected by the reflection mirror.
The phosphor according to any one of the above [1] to [4], wherein the first reflection region and the diffusion transmission region are provided so as to have different radial positions on the rotating plate. Wheel device.
[6] The first reflection region is formed on one surface side of the rotating plate.
The phosphor wheel device according to any one of [1] to [5], wherein the reflection mirror is arranged on one side of the rotating plate.
[7] The phosphor region is
The first fluorophore region and
A second phosphor region in which the wavelength band of the fluorescent light excited by the excitation light is different from that of the first phosphor region,
The phosphor wheel device according to any one of the above [1] to the above [6].
[8] The phosphor wheel device according to the above [5], wherein the phosphor region and the diffusion transmission region are arranged side by side in the circumferential direction.
[9] The rotating plate has a convex inclined surface formed from the outer peripheral edge side toward the central side.
The phosphor wheel device according to any one of the above [1] to [8], wherein the phosphor region is formed on the inclined surface.
[10] The phosphor wheel device according to any one of the above [1] to [9] is provided.
The excitation light source is composed of a semiconductor light emitting element, emits blue wavelength band light as the excitation light, and emits light.
The phosphor region is a light source device that emits red wavelength band light or green wavelength band light when irradiated with the excitation light.
[11] The light source device according to the above [10] and
A display element that is irradiated with the light source light from the light source device to form image light, and
A projection optical system that projects the image light emitted from the display element onto the projected object, and
A projection device control unit that controls the display element and the light source device, and
A projection device characterized by comprising.
[12] An excitation light source that emits excitation light and
It has a phosphor region that is excited by the excitation light and emits fluorescent light, a transmission region that transmits the excitation light and the fluorescent light, and a dichroic mirror region that reflects the excitation light and transmits the fluorescent light. Layers and
A phosphor device comprising.
[13] An excitation light source that emits excitation light and
A layer having a reflection region that reflects the excitation light and a diffusion transmission region that diffuses and transmits the excitation light.
A reflection mirror that reflects the excitation light reflected in the reflection region and guides it to the diffusion transmission region.
A light source device characterized by comprising.
[14] An excitation light source that emits excitation light consisting of a blue wavelength band,
By being configured to rotate about a predetermined axis and being arranged on the optical path of the excitation light emitted from the excitation light source, the excitation light is generated as the rotation is about the predetermined axis. A rotating plate with a variable irradiation area and
A reflection mirror that reflects the excitation light,
With
The rotating plate is arranged so that the excitation light is irradiated from a direction inclined with respect to the predetermined axis, and the first layer located on the upstream side and the second layer located on the downstream side in the optical path. And have
The second layer includes a dichroic mirror region that reflects light in the blue wavelength band and transmits light in the green wavelength band, and a first transmission region that transmits both light in the blue wavelength band and light in the green wavelength band. , The rotating plate is provided so as to approach the irradiation position of the excitation light at different timings when the rotating plate rotates.
The first layer has a first reflection region that reflects the irradiated excitation light toward the reflection mirror and a second layer that transmits the excitation light reflected from the reflection mirror toward the second layer. The transmission region is provided at a position overlapping the first transmission region, and is reflected by the third transmission region and the dichroic mirror region that transmit the irradiated excitation light toward the dichroic mirror region. A phosphor region that emits fluorescent light having a green wavelength band based on the excitation light is provided at a position that overlaps with the dichroic mirror region.
A light source device characterized by that.

10 Projection device 12 Front panel 13 Back panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 21 Input / output connector 22 Input / output interface 23 Image conversion 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir receiver 36 Ir processing unit 37 Key / indicator 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Sound processing unit 48 Speaker 51 Display Element 60 Light source device 70 Excitation light source 71 Blue laser diode 72 Condensing lens 73 Collimeter lens 100 Fluorescent wheel device 101 Fluorescent wheel 102 Reflective mirror 103 First layer 103A Bearing 103a Other side 103b One side 104 Second layer 104A Bearing 104a Other Direction 104b One side 110 Motor 110a Motor shaft 111 Condensing lens group 170 Light source side optical system 175 Light guide device 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 220 Projection optical system 225 Fixed Lens group 235 Movable lens group 241 Control circuit board 261 Cooling fan 301 Third transmission region 302 First reflection region 302a Reflection region 303 Fluorescent region 303-1 Reflection surface 303a First phosphor region 303b Second phosphor region 304 Diffuse transmission Area 305 1st layer central part 401 1st transmission area 402 Dycroic mirror area 403 2nd layer central part B1 to B4 boundary

Claims (14)

An excitation light source that emits excitation light and
A rotating plate having a transmission region that transmits the excitation light, a dichroic mirror region and a first reflection region that reflect the excitation light, and a phosphor region that is excited by the excitation light and emits fluorescent light.
A reflection mirror that reflects the excitation light,
With
The transmission region and the phosphor region are arranged at positions overlapping with the dichroic mirror region.
A phosphor wheel device characterized in that the dichroic mirror region and the first reflection region are arranged at different positions in the circumferential direction. The transmission region includes a first transmission region and a third transmission region, and includes a first transmission region and a third transmission region.
The phosphor wheel device according to claim 1, wherein the transmission region arranged at a position overlapping the dichroic mirror region is the third transmission region. The excitation light irradiated to the third transmission region is transmitted to the third transmission region, reflected by the dichroic mirror region, and then irradiated to the phosphor region.
The second aspect of claim 2, wherein the excitation light irradiated to the first reflection region is reflected by the first reflection region, then reflected by the reflection mirror, and incident on the first transmission region. Fluorescent wheel device. The rotating plate has a first layer and a second layer that overlaps the first layer.
The second layer has the first transmission region and the dichroic mirror region.
The phosphor wheel device according to claim 2 or 3, wherein the dichroic mirror region transmits the fluorescent light. The rotating plate has a second transmission region and has a second transmission region.
The second transmission region is a diffusion transmission region, and is
The diffusion transmission region diffuses and transmits the excitation light reflected by the reflection mirror.
The phosphor wheel device according to any one of claims 1 to 4, wherein the first reflection region and the diffusion transmission region are provided so as to have different radial positions on the rotating plate. .. The first reflection region is formed on one side of the rotating plate.
The phosphor wheel device according to any one of claims 1 to 5, wherein the reflection mirror is arranged on the one side of the rotating plate. The phosphor region is
The first fluorophore region and
A second phosphor region in which the wavelength band of the fluorescent light excited by the excitation light is different from that of the first phosphor region,
The phosphor wheel device according to any one of claims 1 to 6, wherein the phosphor wheel device comprises. The phosphor wheel device according to claim 5, wherein the phosphor region and the diffusion transmission region are arranged side by side in the circumferential direction. The rotating plate has a convex inclined surface formed from the outer peripheral edge side toward the central side.
The phosphor wheel device according to any one of claims 1 to 8, wherein the phosphor region is formed on the inclined surface. The phosphor wheel device according to any one of claims 1 to 9 is provided.
The excitation light source is composed of a semiconductor light emitting element, emits blue wavelength band light as the excitation light, and emits light.
The phosphor region is a light source device that emits red wavelength band light or green wavelength band light when irradiated with the excitation light. The light source device according to claim 10 and
A display element that is irradiated with the light source light from the light source device to form image light, and
A projection optical system that projects the image light emitted from the display element onto the projected object, and
A projection device control unit that controls the display element and the light source device, and
A projection device characterized by comprising. An excitation light source that emits excitation light and
It has a phosphor region that is excited by the excitation light and emits fluorescent light, a transmission region that transmits the excitation light and the fluorescent light, and a dichroic mirror region that reflects the excitation light and transmits the fluorescent light. Layers and
A phosphor device comprising. An excitation light source that emits excitation light and
A layer having a reflection region that reflects the excitation light and a diffusion transmission region that diffuses and transmits the excitation light.
A reflection mirror that reflects the excitation light reflected in the reflection region and guides it to the diffusion transmission region.
A light source device characterized by comprising. An excitation light source that emits excitation light consisting of the blue wavelength band,
By being configured to rotate about a predetermined axis and being arranged on the optical path of the excitation light emitted from the excitation light source, the excitation light is generated as the rotation is about the predetermined axis. A rotating plate with a variable irradiation area and
A reflection mirror that reflects the excitation light,
With
The rotating plate is arranged so that the excitation light is irradiated from a direction inclined with respect to the predetermined axis, and the first layer located on the upstream side and the second layer located on the downstream side in the optical path. And have
The second layer includes a dichroic mirror region that reflects light in the blue wavelength band and transmits light in the green wavelength band, and a first transmission region that transmits both light in the blue wavelength band and light in the green wavelength band. , The rotating plate is provided so as to approach the irradiation position of the excitation light at different timings when the rotating plate rotates.
The first layer has a first reflection region that reflects the irradiated excitation light toward the reflection mirror and a second layer that transmits the excitation light reflected from the reflection mirror toward the second layer. The transmission region is provided at a position overlapping the first transmission region, and is reflected by the third transmission region and the dichroic mirror region that transmit the irradiated excitation light toward the dichroic mirror region. A phosphor region that emits fluorescent light having a green wavelength band based on the excitation light is provided at a position that overlaps with the dichroic mirror region.
A light source device characterized by that.

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